On Tue, 2007-08-21 at 16:40 +0300, Rhythmic Fistman wrote:
> On 8/19/07, skaller <[EMAIL PROTECTED]> wrote:
> > On Sun, 2007-08-19 at 13:13 +0300, Rhythmic Fistman wrote:
> >
> > > My driver itself cheats in this respect, using
> > > an schannel with some c code that reschedules every fthread
> > > hanging on an schannel, as though you executed a "read n times,
> > > discarding result". Um.
> >
> > I actually think you should use the standard driver.
>
> Well, that wouldn't be so hard - apart from hiding the flx
> rtl headers behind an apaque void*, it only really adds one
> thing*: the ability to dump all the readers of an schannel
> back into the active list, that is it "fakes" N writes.
> I tried rewriting that in felix using real writes, but I get
> gc "removed non root" errors and the whole thing's a bit hairy,
> as the code written uses svc calls and can't be guaranteed
> to finish by simply executing its continuations. I need
> to be able to do this step in one fell swoop. The motivation
> for all this is that my driver + support flx file provides
> a global synchrosing timer where n fthreads can run, then
> at a certain point, asked to be suspended for n time units.
> I implement this on the fthread side via reads on an schannel,
> descheduling the fthreads and on the driver side dumping all
> those fthreads back onto the active list with the fake writes.
But this is trivial. You're basically wanting broadcasting:
tick --> [ subscriber list ]
tick --> A
tick --> B
tick --> C
which can be done like:
spawn_fthread {
forever {
read (&x, in_chan);
var i = 0;
while {i<n} {
write (out_chan.[i], x);
++i;
};
};
}
This is a dumb example with a fixed length array of subscriber
channels: a list would probably be better.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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